Abstract
This paper presents a broadband-multiband circularly polarized hexagonal patch antenna. The structure is fed by a unique coplanar hexagonal gap coupled proximity coupled feed with parasitic elements. The antenna is designed using a 14.2×14.2 mm2 FR4 substrate. By introducing hexagonal slot and I slot in the patch, the structure behaves as a multiband antenna with resonating frequencies at 2.76, 5.66 and 11.52 GHz. with 0.2837, 0.4525 and 0.3356 GHz respective bandwidths. By inserting I-shaped slots and rectangular slots in patch and also, I-shaped slots in the ground, the circular polarization is achieved in the L band and C band. The proposed structure was fabricated and tested. The simulated results of the magnitude of S11, radiation patterns and realized gains show good agreement with tested results.
 HIGHLIGHTS
 
 Proposed antenna is single layer broadband multiband circularly polarized hexagonal patch antenna
 A unique feed technique coplanar hexagonal gap coupled proximity coupled feed with parasitic elements is used
 The size of the antenna is compact 14.2×14.2 mm2 and resonating frequencies at 2.76, 5.66 and 11. 52 GHz. with 0.2837GHz/28.37%, 0.4525GHz/ 45.23% and 0.3356GHz/33.56%, respective bandwidths and efficiency
 The antenna is used for WiFi/WiMax application as well as terrestrial communication applications near the costal region or a high humidity environment
 
 GRAPHICAL ABSTRACT
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